Drilling machine



E.;A. oAKEs- DRILLING MACHINE.

March 27, v'1945.

' v10 Sheets-Sheet l Filed Feb. 17. 1943 2 Jvea-.nforc- March 27, 1945. .E A OKES DRIILLING MACHKINE v Filed Remi?, l1945 1o sheets-sheet 2 March v27,4 1945. E. A. oAKEs DRILLING MACHINE lF'i-led Feb. 17, 1943 lO'Sheets-Sheet 5 O es gli?

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` Marc-:h 27, 1945. v v '5, A oAKES DRILLING Mmmm Filed Feb. 17, 1943 1o Sheets-sheet 4 March 27, 1945.

E. A. OAKES DRILLING MACHINE Filed Feb. 17, 1945 1o sheets-sheet 5 rzzegsj Mmh 27, 1945. l E, A, MES 2,372,287

lDRILLING MAQHINE h Filed Feb-'.17' 1945 1o sheets-sheet e March 27, 1945. E A, OAKES' 2,372,287

DRILLING MACHINE Filed Feb. 17, 1943 1'0 sheets-sheet 7 March 27, 1945. 4 E -A. OAKES DRILLING MACHINE l0 Sheets-Sheet 8 Filed Feb. 17. 1943 March 27, 1945.

E; A. oAKEsv DRILLING MACHINE Fixed Feb.' 17, 1943 1o sheets-sheet 9l Top vvv

E. A. OAKES v DRILLING MACHINE fFiledFeb. 17. 1943 Man-ch 27, 1` 945.

INE

l TRn/vsmRl/IER l openings in cartridge cases.

Patented Mar. 27, 1945 UNITED STATES PATENT OFFICEV DRILLING MACHINE. Ernest A. oake, Elkins Park, Pa.

Application February 17, 1943, Serial No. 476,221

8 Claims.

This invention relates to drilling machines and more particularly to a, drilling machine for drilling a multiplicity of openings in each of a multiplicity of turret, fed objectives.

Specically, the invention relates to a machine particularly adapted for use in drilling the ash These openings extend from the bottom of the percussion cap recess of the case base to the interior thereof and are so closely spaced that it is impractical to attempt simultaneous formation by the use of cluster drills. In the majority of instances, these openings are a diametrically spaced pair and are of very small size, particularly in the smaller case sizes such as the cases for shells utilized in airplane and anti-aircraft cannon. Due to the small diameter of the drills necessary to form these openings, it is essential that the exposed drill length be maintained at a minimum, that pressure be applied to the drill uniformly and that the drills be in high speed operation prior to any contact of the drill with the metal of the case. Again, due to the small size of the drills necessary, it is essential that some means beprovided for automatically indicating the failure of any one of these drills since such vsmall drills may readily break without any indication to the machine operator, particularly, where, as

in the present instance, a fairly large gang of drills is in simultaneous operation.

Accordingly, a primary object of the present invention is the provision kof means for drilling such openings whicha `incorporates mechanism whereby the supported work and drills, one for each case being drilled, may be relatively accurately jogged, following an initial drilling operation on the case, to position the shell cases for the second drilling operation.

Another object of the 'invention is the provision of means for rmly holding the cases against possible circumferential displacement about their axes during those intervals in the drilling operation at which the drill is not actively engaged therewith. f

Another object of the invention is 4to provide means for removing the cases from the supports upon which they are held during the drilling operation following the completion of such drilling operation, which means incorporates an apparatus for detecting the presence of an improperly drilled case and for halting the drilling oper-k ation until the case is removed.

A still further object is the provision of an apparatus incorporating a drilling halting mechanism of the type just described which further includes a means for displacing an improperly drilled case with relation to the remaining shell cases so that it may be readily detected and removed. Another object of the invention is the provision of mechanism for feeding the cases to the holding appliances, which mechanism will preferably include 'a safety device designed to prevent destructive jamming in the event a shell case fails to properly engage the holding member of the turret by which it is to be transferred to the drilling and discharging mechanism.

Another object; of the invention is to provide a drilling spindle mounting, by meansv of which the idle position of the spindle with relation to the work may be very closely regulated to thereby enable the utilization of a minimum exposed drill area and to insure substantially simultaneous engagement of the drills with the` shell cases.

Another object Yof the invention is the provision of a structure of this character which may be relatively cheaply and rapidly produced, and which will be efficient in operation and a general improvement in the art. f

These and other objects I attain by the construction shown in the accompanying drawings,

wherein for the purpose of illustration, I have shown a preferred embodiment of my invention and wherein: n

Figure l is a side elevation of a shell case drilling, machine constructed in accordance with my invention; y Figure 2 is an elevation of the drilling machine taken from the opposite side thereof;

Figure 3 is a section on line 3-3 of Figure 1;

Figure4 is an enlarged section on line 4--4 of Figure 1; l

Figure 5 is a section on line 5-5 of Figure 4;

Figure 5A is a section on line 5ft-5a of Figure 5;

Figure 6 is a detail view'illustrating the means for insuring correct positioning of the turret;

, Figure 7 -is an enlargeddetail sectional view illustrating the relative positions of the vturret and ejecting mechanism at the time of engagement'of the ejector therewith;

Figure 8 is a view similar to that of Figure 7, but illustrating the shell casings as withdrawn from their supports and being discharged from the machine;

Figure 9 is a View similar to those of Figures 7 and 8 illustrating the method of stopping the machine in the event there is an improperly drilled 'shell case andl of indicating the positionv of the improperly drilled shell case to the operator;

Figure is a perspective view illustrating the construction of one of the ejector units;

Figure 11 is an enlarged partial section taken on line 3 3, of Figure l.

Figure 12 is a base view of a shell case illustrating the position of the ash openings;

Figure 13 is a vertical sectional View through the shell casing of Figure 12 illustrating in solid and dotted lines the positions ,of the single drill forming the openings therein;

Figure 14 is a vertical sectional view through one of the drill spindle mountings employed; and

Figure 15 is a wiring` diagram illustrating the connections employed with the several control switches utilized.

Turret control (Figs. 1 to 3, 5 and t6) Referring now more particularly to the drawings, numeral ,I generally designates the main frame of the machine which rotatably mounts .a turret II. This turret comprises a body section `I2 generally rectangular in formation and provided at its ends with trunnions I3 engaged in bearings I4 on the sides of the frame IB. Intermediate the sides .of the frame, the turret body bears .a plurality of radially extendinglbrackets I5, each .secured at its base to the body I2 and each having associated therewith a plurality of shell case receiving studs 16. The studs I6, as more clearly shown .in Figure 1,1, each ycomprise a tapered section Il, the'smaller -freeend of Which is of .considerably less diameter than the `mouth or vprojectile .receiving end of the shell case so that it may readily enter the same. Such free ends are furthermore grooved .at II8 at the sides thereof which are longitudinally disposed. as regards the axis of the turret to provide drill clearance while, at the same time. ,alfording at the outer end of the spindle, a suicient support for the inner or butt `end of theshell case. Each of the brackets I5 furthermore provides a plu-- rality of clamps, one associated with .each stud I6 .and .each comprising a block I9 having -aface .thereofk which confronts the bracket I5 pro vided with a V-notch 2-0 and each provided with spring guides 2 I, the springs of which constantly Aurge the `spring block toward the bracket. The

shell case, `when .applied to the stud by a feeding mechanism, hereinafter to be described, initially engages freely over .the stud and through the mouth of the clamp providedA by the notched block rjust described, by reason of the relativelyf .small .diameter of the projectile receiving .end 22 of the shell case 2'3.` These clamps exert suiiicient pressure upon the shell case to prevent any rotation thereof during the step-by-step motion which is imparted to the turret or by the drilling operation.

In the present illustration, the turret is shown as provided with "four brackets andas operating through four station positions which may be designated as the loading position L, the drilling position D, the extracting position E and the idle position I. It will, of course, 'be understood that in lieu of the particular number of brackets herein disclosed, theturret might be equipped lwith any desired number of brackets in which case the idling positions would be arranged to suit the particular design adopted. The mechanism for controlling theoperation of the turret comprises a main shaft 24 driven through a reduction gear 25 by a motor 2S. The shaft 24 through gear 21 and pinion 28 drives the shaft 29, upon which is mounted an eccentric gear 3U, meshing with a similarly eccentric gear 3I mounted on a cross shaft 32. The cross shaft 32 mounts the control disc 33 of a Geneva movement 34, which movement controls the step-by-step rotation of the turret II. To insure accurate positioning of the turret at each of its stations, one of the trunnions of the turret has mounted thereon a plate 35 having in its periphery a series of notches 3B adapted for fthe reception. of a plunger 3'! mounted in suitable guides 38 secured to the frame I0. Movement of this plunger in one direction is controlled by a spring 39, while its movement in the opposite direction, in which itis withdrawn from the notches 36 to .permit rotation VAof the turret, is controlled by a bell crank 40, .one larm `of which engages the plunger and the other arm of which engages a cam 4I secured to 'shaft 32.

Drilling spindles cmd the controls therefor (Figs l to 3, 5'and 14) prise upper and lower arms 41 and 48 mounting 'bearings 49 for the `spindle 5U. The lower end loi :each spindle comprises the usual chuck 5I for drill 512, 'there ybeing one spindle and its mounted .drill for each Astud-of the respective turret brackets. 'The spindle is urged upwardly by a spring 5'3 and the upper end of the spindle is provided with a bearing mounted cap 54. The bearings 49 of the spindle are preferably lubricated by arranging a lubricant container at the upper end .of the bracket and connecting lthe same by a port 55 -to the upper end of the upper bearing 49, from which bearing the lubricant is conducted, by `a port l51, to and :through the lower bearing 49 and iinally to a collection outlet, generally desighated at 51a.' The standards 42 additionally support a transverse rock-shaft 58 having a tappet arm .53 for each drill spindle Si). The iur- -cate outer ends of these arms 'swivel blocks @il through which are adj'ustably directed the threaded stems 6I of the tappets proper. These ta'ppets have an enlarged and flattened head 62 at the lower ends which' engages against the upper surface ofthe cap 54 of the upper end of the associated drill spindle and serve as a means for adjusting the lvertical limit of movement of the associated drill spindle. In -order that eleva* tion of a given spindle may be insured even though the spring l53 of one or more of the spindles fail, means are provided to prevent any but avery limited separation of the c'ap and the associated tappet, this means being at present disclosed as comprising clips 63 secured to the cap and having angular upper ends overlying the upper-surfaces of the enlarged heads ofthe tappets. The rock-shaft 58 is actuated through an arm S4 secured thereto vand engaging through a follower the periphery of a cam $6 secured to shaft 29.

The slide 44 is actuated through a cam 6l secured to shaft 32 at the right-hand side of the machine, this cam being more clearly shown in Figures 2 and 11. This cam is arranged to hold the slide in one position during the initial portion of the stay of a given bracket of the turret at the drilling station D, during which period the cam 66 initially acts to depress the drilling spindles and form an opening at one side of the base of the percussion cap recess 68 of the shell case 23. The drill spindles are then permitted to elevate, following which the cam 61 shifts the slide to the left in Figure 11. Following which the drill spindles are again depressed to form the second opening in the drill. case. The spacing of these openings may obviously be regulated by the vconfiguration of cam 66. Cam 66 is providedwith a relatively short depression 69 whichprovides for elevation of the drills during shifting oi the slide 44 and with a second elongated depression .10'- which provides for elevation of the drillsduring the advance of the turret from one station to another.

The spindles 46 are driven by a spindle motor Extracto?` mechanism (Figs. 7-10) Supported by the sides of theframe I0, on guides 80 is a slide 8| reciprocated in timed relation to the turret movements by means of an eccentric 82 mounted on shaft 29. This eccen-` tric through link 83 engages a rock-arm 84 bearing a. segment 85 engaging a rack on the under surface 'of slide 8|. Mounted on slide 8| are a plurality of extractor heads 86, an individual example of which is shown in Figure 10. Each extractor head comprises a block 81 preferably rectangular in form and having a stem 88 extended through and secured to a crossbar 89 .of slide 9|. Each head includes at least one pivoted lever 90 which is spring positioned by spring 9| to engage its grappling beak 92 in the extractor groo-ve 93 oi a shell case mounted upon an opposed stud l@ ofy a bracket which is disposed in the extractor position E. When a bracket of the turret arrives in the extractor position, the control lmechanism advances slide8| bringing the extractor levers 90 into position to engage the shell case and immediately prior to the next advancing step of the turret, the slide 8| is moved rearwardly, carrying with it the drilled shell cases. After a predetermined rearward movement of the slide the rear ends of levers 90 are engaged by a trip 94 whichdepresses the same, thereby releasing the shell cases and permitting the same to fall to a discharge chute 95, as more clearly shown in Figures 'l and 8.

As pointed out hereinbefore, due to the small size of the drills employed and further tothe nature of the materials (brass and bronze alloys), breakage of drills of the small diameters necessary may occur at any movement. Thus, in a practical machine of the character under discussion, it becomes necessary to provide a means for detecting the presence of any improperly drilled case. To provide such a means, I mount in each of the extractor heads a spring pressed plunger 96, forward movement of which is urged by a spring 91 and limited by a plate 98.q This plunger has at its forward end a pair of 'feeler prongs 99, positioned for extension through the openings formed in the aligned shell case by drill 52. In event one or more of theseopenings has not been formed or has been incompletely formed, the plunger is moved rearwardly through engagement of the feeler point with the base of the shell. The plunger has a rearwardly extending stem |00 which, when the plunger is moved rearwardly, engages with a plate |0| moving the same against the action of the spring |02 to cause actuation of amicro-switch |03. Under these circumstances, the micro-switch |03 is opened thereby instituting opening of the circuit of the motor 26 and at a given time stopping the machine. f

Since the plunger 99 of the improperly drilled shell case will exert a spring pressure against the base of the improperly drilled shell at a point radially spacedfrom the ypoint at which the extractor grips'it, this shell will be cocked out of line with the shells which have been properly drilledfand which will be still held by the extractors due to the fact that stoppage occurs prior to engagement of levers 90 with the trip-g ping element 94 and after the cases have cleared the studs by reason ci the conclusion of a timer hereinafter more fully described. The operator may accordingly readily detect the improperly drilled shell and remove the same beforeagain v starting the machine.r With starting of the machine the properly drilled shells will be dropped into the chute and the operation of the machine will proceed normally.

By reason of the use of feeler prongs 99, it becomes necessary to insure stripping of the shells from the extractor mechanism, for after the release of the grappling beaks 92 the shells might otherwise remain on these feeler prongs. For this reason, I mount upon the Slide 8| for shifting movement in a direction longitudinal to the machine a stripping plate |04. This plate has its movement limited through a'slot and pin engagement as at |0441. and may be held in a re-J tracted position by means of springs |0411. It is pointed out, however, that the springs |0412` may be omitted, since the stripping plate will be ad vanced upon the slide 8| by the pins of the slot and pin engagement at |04a during retraction of the slide and as the slide is advanced will engage the heads of the shell cases and thereby be retracted upon the slide. This plate has at its forward edge a series of down-bent fingers |04c projecting between adjacent extractor heads 86 for engagement with diametrically opposite p0rtions of the shell base. vAs the slide moves rearwardly in the extracting operation and the pivoted levers are tripped by trip 94, the rear edge of this slide engages against stops |04d, carried by the machine frame, so that the down-bent fingers |04c are caused to extend beyond the front faces of the heads 8B and completely disengage the shell from the feeler fingers.

It may, ofcourse, happen that a normally drilled shell may, through somefailure, pass the exthactor mechanism and remain on the stud through the idler position of the turret. Under these conditions, if the shell continued to remain in position until the bracket of which the stud formed a portion was at the loading position, serious damage to the machine might occur. I accordingly arranged between the extracting position and the loading position, a detector generally designated at |05. This comprises a hinged plate |05a., so arranged as to` clear the turret mechanism, per se, ibut to be disposed in the path of a shell case carried by any of the studs of a bracketl ef the turret. If engaged by a shell case, which the extractor has failed to remove,

I thereby stop- Loading mechanism The loading mechanism, more particularly shown in Figures and 5A, comprises a magazine Hi8 which through vertical partition walls |09 is subdivided into a plurality ofl chambers corresponding in number and spacing to the spindles of the individual station brackets. of the turret, such chambers being adapted for the reception of a stack of shell cases 23. bottom of each chamber the side walls are inwardly curved as at |09a to provide a slotted bottom, as more clearly shown in the section forming Figure 5A, and the front and rear walls of the magazine are terminated slightly above the bottom thereof. Mounted for reciprocation beneath the magazine is a feeding plate l l@ which is connected to slide 8| as at |i| for simultaneous movement therewith. This plate mounts Dushers H2, one for each of the chambers of the magazine and aligned with the slot I i3 at the bottom thereof. As the plate il, during an extracting operation by the extractor mechanism carriedby slide 8|, is moved to the left in Figure 5, these pusher plates H2 engage the lowermost shell in the magazine chamber and force the same from the rear end of the magazine onto engagement with the aligned stud of the turret. Arranged adjacent the pusher plates is a safety switch H4 which is controlled by a hinged plate H5 arranged adjacent the forward edges of pusher plates I2 and held in contact therewith by a spring H6. The pusher plates ||2 are connected to the feeding plate lill by shear pins and in the event any jamming occurs, such as might result from accidental entrance to the magazine of foreign matter, these pins will shear enabling the aiected pusher plate v||2 to shift the detector plate ||5 and cause operation of the switch thereby stopping the machine.

It will be obvious that in order to accomplish the visual indication of an improperly drilled shell hereinbefore described and illustrated in Figure 9, it will be necessary that the ejector mechanism. be permitted to move rearwardly at least a distance suihcient to enable the shell case to clear the rear ends of the studs from which they are being removed. To this end, I employ a timing switch H8 which, while it might be arranged for operation by any .part moving synchronously with the slide 8|, is at present disclosed las being arranged [beneath the feeding plate il@ and as being controlled by cam M9 secured to this plate. The switch H8 is in circuit with the detector switch and is normally open and the cam I I9 will not close switch lli! until the plateV Ilil has moved to the left in Figure 5 a distance suicient to enable the ex- 'tractor mechanisms to disengage the shell cases from the studs of the bracket at the extractor station. At this time, the cam |39 will close switch H3 and in the event switch |03 has been closedythe circuit to the motor 26 will be broken and operation of the machine stopped.

At the i* Operation Assuming the machine to be completely stopped with the parts in the positions illustrated in Figure 5 and assuming that all of the shell'cases upon the studs I3 to have been properly drilled, switches' ID3, |86, ||4 and ||8 are open. The operator first closes the starting switch |20 of the drill operating motor lll. This switch closes the starting circuit S-`|| for the motor oper- [ating solenoid switch |2| and thereby closing both the motor circuit of motor 'Il and a holding circuit H-TI for switch |2|. The completion of the circuit of motor 7| prepares a circuit |22 for main motor 26. The operator then closes switch |23, which through solenoid switch |24 'completes' the circuit to the main motor 26, which as illustrated in the diagram forming the Figure 15, is preferably of that type having solenoid release brake |25, the release of which occurs simultaneously with the completion of the circuit to the motor. The solenoid switch |24 for motor completes a holding circuit H-ZS for the circuit of the motor 25. This holding circuit includes a normally' closed solenoid operiated switchv lit, the circuit of the actuating coil of which is completed by closure of either switches |06 or II@ or by the simultaneous closing of switches I |33 and I8. The main motor having been started, the initial operation from the position illustrated in Figure 5 is that of shifting the shell cases upon the studs at station E from their studs with simultaneous application of fresh shell cases to the studs at station L. Assuming that there is no jamming of the newly supplied shell cases at the station L, this operation will be completed and the drilled shell cases from the extractor station E will be discharged into the chute 95. If a jam occurs at the loading station, switch H4 will be closed and switch |26 opened thereby breaking the circuit to the main motor 2t through opening of the holding circuit of switch illl controlling the same. Assuming that an extractor has failed to remove ashell case and that the same has passed through the station I, this shell case upon engagement with plate IE5 will open switch liliof detector |04 thereby completing the circuit of switch |25 and stopping motor 26.

Again let it be assumed that of the shell cases upon the studs -at station E, one has been improperly drilled due to drill breakage or some other cause. In this case, the extractor which engages this particular shell has during the movement of the slide lil to the position illustrated in Figure 5 brought its feeler prongs 99 into engagement with the improperly drilled surface of the defective shell with the result that switch |3 is closed. This will not, at this time, cause stoppage of the machine due to the fact that switch I|8 is open. When, however, continued operation of the main motor has shifted the slide 8| to the left for a short distance thereby moving with'it the iced plate lli), cam llt will close switch I 'i3 thereby completing the circuit to the switch `|25 and stopping motor 26. It will be noted that completion of any of the safety stop circuits will render it impossible to again close the circuit of motor ZEE except under jogging control, such as may be necessary to position the parts in order that the fault causing stoppage may be eliminated. By utilization of signals |01 in the individual safety switch circuits, the presence 0f tle fault may be readily detected and cured.

Since the construction illustrated is obviously asvaee'r capable of considerable niodillcation without departing from the spirit of my invention, I do not wish to be understood as limiting myself thereto except as hereinafter claimed.

'Iclaimt l *y j -l`. An extractoi" mechanism for drilling machineshaving a rotatable turret providedwith axial'rows ofholders for articles to be drilled aidmeans for limparting a step bystep rotation `to the turret toY successively aline said holder j rows with the extractor mechanism after drilling of articles held thereby, said extractor mechanism comprising a reciprocable extractor for each holder andyadapted to engage the drilled article at a point spaced from the opening drilled therein and withdraw it from the holder and a yieldable feeler associated with each extractor and adapted to enter the drilled opening of the article, said feelers and extractors acting to support the articles when completely extracted from the holders and to provide differing supported positions Ifor properly and improperly drilled articles.

' 2. An extractor mechanism for drilling machineshaving a rotatable turret provided with axial rows of holders for articles to be drilled and means for imparting a step by step rotation to the turret to successively aline said holder rows with the extractor mechanism after drilling of articles held thereby, anism comprising a reciprocable extractor for each holder and adapted to engage the drilled article at a point spaced from the opening drilled therein and withdraw it from the holder and a yieldable feeler associated with each extractor and adapted to enter the,drilled opening of the article, said feelers and extractors acting to support the articles when completely extracted from the holders and to provide differing supported positions for properly and improperly drilled articles, means to release the extracted articles and means to prevent operation of said releasing means if any of the extracted articles is improperly drilled.

3. An extractor mechanism for drilling rhachines having a rotatable turret provided with said extractor mechthe holder, a yieldable eeler associated with each extractor and adapted to enter the drilled opening of `the article, said feelers andextractors acting to support the articles when completely extracted from the holders and to provide' differing supported positions for properly and `improperly drilled articles,` and means `to prevent operation ror saidA releasing and disengaging means if any of the articles are improperly drilled.'

5. An extractor mechanism for drilling machines having a rotatable turret provided with axial rows of holders for articles to be drilled `and means for imparting a step bystep rotation to the turret to successively aline'said holder rows with the extractor mechanism after drilling of articles held thereby, said extractor mechanism comprising a reciprocable slide, an extractor for each holder carried by the slide and adapted to engage the drilled article at a point spaced from the opening drilled therein and withdraw it from the holder, a yieldable feeler associated with each extractor and adapted to enter the drilled opening of the article, said feelers and extractors acting to support the articles when completely extracted from the holders and to provide diierng supported positions for properly and improperly drilled articles, means to check reciprocation of the slide operation of which is initiated by engagement of a feeler with an improperly drilled article and means to prevent operation of .the last named means until the articles are completely disengaged from the holders.

6. An extractor mechanism for drilling machines having a rotatable turret provided with axial rows of holders for articles to be drilled and means for imparting a step by step rotation to the turret to successively aline said holder rows with the extractor mechanism after drilling of articles held thereby, said extractor mechanism comprising a reciprocable extractor for each holder land adapted to engage the drilled article at a point spaced from the opening drilled therein and withdraw it from the holder and a yieldable feeler associated with each extractor and adapted to enter the drilled openingof the article, said feelers and extractors acting to support the araxial rows of holders for articles to be drilled and means `for imparting a step by step rotation to the turret to successively aline said holder rows with the extractor mechanism after drilling of articles held thereby, `said extractor mechanism comprising a reciprocable slide, an extractor for each holder carried by the slide and adapted to engage the drilled article at a point spaced from the opening drilled therein and withdraw it from `the holder, a yieldable feeler associated with each extractor and adapted to enter the drilled opening of the article, said feelers and extractors acting to support the articles when completely extracted from the holders and to provide differing supported positions for properly and improperly drilled articles, and means oper-ated by reciprocation of the slide for releasing said extractors and disengaging the articles from said feelers.

4;. An extractor mechanism for drilling machines having a rotatable turret provided with axial rows of holders for articles to be drilled and means for imparting a step by step rotation to the turret to successively aline said holder rows with the extractor mechanism after drilling of articles held thereby, said extractor mechanism comprising a reciprocable slide, an extractor for each holder carried by the slide and adapted to ,engage the drilled article at a point spaced from the opening drilled therein and withdraw it from ticles when completely extracted from the holders and to provide differing supported positions for properly and improperly drilled articles, means to release the extracted articles and means to prevent operation of said releasing means if any of the extracted articles is improperly drilled, comprising electrical means to check reciprocation of said extractors and a circuit for said electrical means closed by engagement of a feeler with an improperly drilled article.

'7. An extractor mechanism for drilling machines having a rotatable turret provided with axial rows of holders for articles to be drilled and means for imparting a step by step rotation to the turret to successively aline said holder rows with the extractor mechanism after drilling ofv articles held thereby, said extractor mechanism comprising a reciprocable slide, an extractor for each holder carried by the slide and adapted to engage the drilled article at a point spaced from the opening drilled therein and withdraw it from the holder, a yieldable feeler associated with each extractor and adapted to enter the drilled opening of the article, said feelers and extractors acting to support the articles when completely extracted from the holders and to provide differing supported positions for properly and improperly drilled articles, and electrical means to prevent operation of `said releasing and disengaging means if any of the articles are improperly the holder, a yieldable feeleiassociated with each drilled, including a switch carried by 'the lslide extractor and adapted to enter the drilled openand operated by engagement of a 'feeler with an ing of the article, said'feelers and extractors actimproperly drilled article. ing to support the articles when completely ex- 8. An extractor mechanism for drilling matracted from the holders and to provide dierchines having a rotatable turret provided with ing supported positions for properly and imaXial-rows of holders for articles to be drilled and properly drilled articles. electrical means to means for imparting a step by step rotation to the check reciprocation of the slide comprising an turret to successively aline said holder rows with open circuit closure of which is initiated by enthe extractor' mechanism aftendrilling of arlo gagement of a feeler with an improperly drilled ticles held' thereby, Said extractor'mecha'nism article and timing means to prevent closure of the comprising a reciprocable slide, an extractor for circuit until the articles are completely diseneach holder carried by the slide and adapted to gaged from the holders. engage the drilled article at a point spaced from the opening drilled therein and withdraw it from ERNEST A. OAKES. 15 

